198 LICHEXACKI. [llAMALIXA. 



is merely an accidental state of this species. Brit. EMS. : Leight. 

 n. 2. 



This differs from R. scopulorum chiefly in the absence of any chemical 

 reaction of the medulla. The thallus is variable in size and in the 

 character of the lacinise, and is often roughish with spermogoniiferous 

 pustules. The apothecia, except in the occasionally striatulate receptacle 

 and the size of the spores, are, as well as the spermogones, similar to 

 those of R. scopulorum, though often congested and difform. 



Hob. On rocks and boulders in maritime districts, rarely on hills at a 

 distance from the sea. Dlstr. General and abundant on all the rocky 

 coasts of Great Britain, the Channel Islands, and probably also of Ire- 

 land. B. M. : Island of Guernsey. Leigh Tor, Dartmoor, near Ply- 

 mouth, Wembridge, and Torquay, Devonshire ; Land's End, Tintagel, 

 the Lizard, Lamorna, St. Breock, and Pentire, Cornwall ; Tenby, Pem- 

 brokeshire ; Aberdovey and Dolgelly, Merionethshire ; South Stacks, 

 Island of Anglesea ; Pwllheli, Carnarvonshire ; Holy Island, Northumber- 

 land ; St. Bees, Cumberland. Solway Firth, Kirkcudbrightshire ; Rivel- 

 ston and Cramond Island, near Edinburgh; Innerkip, Renfrewshire; 

 1J inks of the Tay and Turin Hill, Forfarshire ; Kinnoul Hill, Perthshire ; 

 Portlethen, Kincardineshire ; near Peterhead, Aberdeenshire. Great 

 Island, Cork ; Ardglass, co. Down. 



Form minor Nyl. Bull. Soc. Linn. Normand. ser. 2, iv. (1870) 

 p. 159. Thallus small, erect; laciuiae simplish, slender, subulate. 

 Apothecia small, terminal or subterminal. Cromb. Grevillea, vii. 

 p. 141. 



A much dwarfed condition, being only \ in. to 1 in. in height, with the 

 lacinire often black at the apices. The apothecia are small and usually 

 numerous. 



Island of Guernsey. "Wembury, Devonshire; Eowey and near Penzance, 

 Cornwall ; Tenby, Pembrokeshire ; Aberystwith, Cardiganshire ; St. Bees, 

 Cumberland. Portlethen, Kincardineshire. 



Var. ft. crassa Del. ex Nyl. Bull. Soc. Linu. Xormand. ser. 2, iv. 

 (1870) p. 159. Thallus somewhat small, thick, subopaque, tuber- 

 culoso-difform, rigid, shortly laciniate ; laciniaD dilated, sparingly 

 divided (medulla K ). Apothecia chiefly terminal. Cromb. Journ. 

 Bot. 1874, p. 147 ; Leight. Lich. Fl. ed. 3, p. 90. 



Analogous to var. incrassata of R. scopulorum, from which it differs in 

 the absence of any chemical reaction of the medulla. The thallus is 

 sometimes terebrate in old plants. Our British specimens are rarely 

 fertile. 



Hob. On rocks and boulders in maritime tracts. Distr. Local and 

 scarce in the Channel Islands, S. and N. England, and in N.E. Scotland. 

 B. M. : La Moye, Island of Jersey. Near Penzance, Cornwall ; St. Bees, 

 Cumberland. Portlethen, Kiucardiueshire. 



Subsp. R. breviuscula Kyi. Flora, 1873, p. 66. Thallus small, 

 depressed, firm, often subpulviriato-stipatc ; laciniae short, congested, 



